Controls. THERMAL OVERLOAD RELAYS RW..D (up to 40A)
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1 Controls THERMAL OVERLOAD RELAYS RW..D (up to 0A)
2 Thermal Overload Relays RW..D (up to 0A)
3 THERMAL OVERLOAD RELAYS RW..D (up to 0A) Summary Introduction RW7-D Thermal Overload Relay from 0.8 up to 0 A 7 Accessories 7 Technical Data 8 Dimensions (mm) Mounting Position Thermal Overload Relays RW..D (up to 0A)
4 Thermal Overload Relay RW thermal overload relays are designed to be combined with contactors to assemble motor starters. Thermal overload relays are very reliable devices intended to protect motors, controllers and branch-circuit conductors against phase failures and overloads that cause excessive heating. The thermal overload relay has no power contacts and cannot disconnect the motor by itself. Motor overloads or phase failures increase the motor current. This current increase trips the mechanism and switches the auxiliary contacts. The auxiliary contacts, when properly wired in series with the coil of the contactor will de-energize the contactor when an overload occurs. Thus, the contactor disconnects the power to the motor and stops its operation. The bimetallic thermal overload relays have thermal memory. Once tripped, the relay will not reset until it has cooled down, allowing the motor to cool before it can be re-started. General Information Identification tag Multifunction RESET / TEST button Current setting dial Auxiliary contact terminals Main contact terminals Applications RW thermal overload relays have been designed to protect three-phase and singlephase AC motors and direct current motors ). When the RW thermal overload relays are intended to protect single-phase AC loads or DC loads, the connection should be made as shown in the diagrams on page C-9. RW Thermal Overload Relays in Contactor Assemblies for Wye-Delta Starters When using thermal overload relays in conjunction with contactor assemblies for wye-delta starters, it should be taken into consideration that only 0.8 ( / ) x the motor current flows through the main contactor. An overload relay mounted on the main contactor must be set to the same multiple of the motor current. A second overload relay may be mounted on the wye contactor if it is desired the load to be optimally protected in wye operation. The wye current is / of the rated motor current. The relay must then be set to this current. Protection Against Short-Circuit The RW thermal overload relays must be protected against short-circuits by fuses or circuit breakers. Ambient Air Temperature Compensation RW thermal overload relays are temperature compensated. Its trip point is not affected by temperature, and it performs consistently at the same value of current. The time-current characteristics of RWs refer to a stated value of ambient air temperature within the range of -0 C to +0 C and are based on no previous loading of the overload relay (i.e. from an initial cold state). For ambient air temperature within the range of +0 C up +80 C (maximum ambient air temperature), the current correction factor shown in the table below should be applied: Ambient air temperature Current correction factor C C C C 0.7 Note: ) Models RW7 and RW07 should be used only with electric motors in alternating current. Thermal Overload Relays RW..D (up to 0A)
5 Site Altitude Compensation The site altitude and hence the air density play a role with respect to the cooling conditions and dielectric withstand voltage. A site altitude of up to 000 m is considered as normal in accordance with IEC 097. For higher altitudes, the current settings on the thermal overload relay should be higher than the motor rated current. On the other hand, the operational voltage must be reduced. For site altitudes higher than,000 m, the values for the current and voltage shown in the table below should be applied: Altitude above sea level (m) Adjustment factor on the current setting Maximum operational voltage U e (V), x I n 90,000.0 x I n 0, x I n 80,000. x I n 0 Characteristic Tripping Curve Thermal overload relays are designed to mimic the heat actually generated in the motor. As the motor temperature increases, so does the temperature of the overload relay thermal unit. The motor and relay heating curves have a strong relationship. No matter how high the current drawn by the motor, the thermal overload relay provides protection and yet, does not trip unnecessarily. Thus, the characteristic tripping curves indicate how the tripping time, starting from the cold state, varies with the current for multiples of the full-load current for three-pole symmetrical loads. Min Phase Failure Sensitivity In order to ensure fast tripping in case of phase loss, protecting the motor and avoiding expensive repairs / corrective maintenance services, RW7-D thermal overload relays include phase failure sensitivity protection as standard. For this purpose, they have a differential release mechanism that, in the case of phase failure, ensures the de-energized cooled down bimetal strip to generate an additional tripping displacement (simulating an overcurrent that actually doesn t exist). This way, in the event of phase failure, the differential release ensures tripping at a lower current than with a three-phase load (characteristic curve below). However, for more effective protection against phase failure, specific protective products should be evaluated ensuring that such failure is detected much faster. The curve below shows the tripping time in relation to the rated current. It is also considered average values of the tolerance range and at ambient temperature of 0 C starting from the cold state. -pole load, symmetrical -pole load on a -pole relay 0 Sec t A xl n x setting current Thermal Overload Relays RW..D (up to 0A)
6 Multifunction Reset / Test Button The thermal overload relay has a multifunction RESET / TEST button that can be set in four different positions: A - Automatic RESET only; AUTO - Automatic RESET / TEST; HAND - Manual RESET / TEST; H - Manual RESET only. In HAND and AUTO positions, when RESET button is pressed, both NO (97-98) and NC (9-9) contacts change states. Operation description In H (manual RESET only) or A (automatic RESET only) position, the test function is blocked. However in the positions HAND (manual RESET / TEST) or AUTO (automatic RESET / TEST) it is possible to simulate the test and the trip functions by pressing the RESET button. When set in the H or HAND position the RESET button must be pressed manually to reset the overload relay after a tripping event. On the other hand, when set in A or AUTO position, the overload relay will reset automatically after a tripping event. The H, HAND, AUTO and A function setting is carried out by rotating without pressing the red button and placing it on the desired position of the RESET button. When changing from HAND to AUTO, the RESET button must be slightly pressed while the red button is rotated. Functions H HAND AUTO A Relay reset Manual ) Manual ) Automatic Automatic Auxiliary contact trip test 9-9 (NC) Function is disabled Test is allowed Test is allowed Function is disabled Auxiliary contact trip test (NO) Function is disabled Test is allowed Test is allowed Function is disabled Note: ) A recovery time of a few minutes is necessary before resetting the thermal overload relay. Recovery Time The RW thermal overload relays have thermal memory. After tripping due to an overload, the relay requires a certain period of time for the bimetal strips to cool down. This period of time is so-called recovery time. The relay can only be reset once it has cooled down. The recovery time depends on the characteristic tripping curves and the level of the tripping current. After tripping due to overload, the recovery time allows the load to cool down. Operation in the Output Side of Frequency Inverters The RW7-D thermal overload relays are designed for operation on 0/0 Hz up to 00 Hz and the tripping values are related to the heating by currents within this frequency range. Depending on the design of the frequency inverter, the switching frequency can reach several khz and generate harmonic currents at the output that result in additional temperature rise in the bimetal strips. In such applications, the temperature rise not only depends on the rms value of the current, but on the induction effects of the higher frequency currents in the metal parts of the device (skin effect caused by eddy currents). Due to these effects, the current settings on the overload relay should be higher than the motor rated current. Thermal Overload Relays RW..D (up to 0A)
7 RW7-D Thermal Overload Relay from 0.8 up to 0 A Bimetallic overload relay with tripping class 0 Phase failure sensitivity protection Temperature compensation Manual or automatic reset Direct mounting on CWB contactors Hand/Auto/Reset button Auxiliary contacts NO + NC Direct mounting Blue version Setting current (A) Circuit diagram Screw terminals Reference CWB RW7-D-D00 CWB RW7-D-C0 CWB RW7-D-D008 CWB RW7-D-D0 CWB RW7-D-D08 CWB RW7-D-D08 CWB RW7-D-U00 CWB RW7-D-D0 CWB RW7-D-U008 CWB RW7-D-U00 CWB RW7-D-D CWB RW7-D-U0 CWB RW7-D-U07 CWB RW7-D-U0 CWB RW7-D-U0 CWB RW7-D-U00 Weight kg 0. Accessories External Cable for Reset Illustrative picture Description Cable length (mm) Reference code Weight (kg) Metallic cable for external reset of all overload relays models RW assembled on electric panels and MCCs Notes: - Hole for external fixation: Ø...7 mm - Panel plate thickness: or. mm 0 ERC0RW ERC7RW ERC00RW Thermal Overload Relays RW..D (up to 0A) 7
8 Technical Data Main Data Models Standards IEC 097- and UL 08 Rated insulation voltage U i (pollution degree ) RW7 IEC (V) 90 UL, CSA (V) 00 Rated impulse withstand voltage Uimp (IEC 097-) (kv) Rated operational frequency (Hz)...00 Use with direct current Maximum operation per hour (ops./h) Protection degree (IEC 09) Mounting Main contacts Auxiliary contacts Frontal Yes IP0 IP0 IP0 Direct on the contactor Resistance to impact (IEC / sinusoid) (g/ms) 0/ Ambient temperature Transport and storage -0 ºC ºC Operating -0 ºC ºC Temperature compensation -0 ºC...+0 ºC Altitude (m) 000 Main Contacts Models Rated operational voltage U e UL, CSA (V) 00 IEC (V) 90 RW / / / /...8 / /.8... / 0... / Setting current / max fuse (gl/gg)) (A)... 8 / / 8... / 0... /...7 / 0... / 0... /...0 / 90 Average power dissipation per pole (W) 8 Thermal Overload Relays RW..D (up to 0A)
9 Auxiliary Circuit Models Standards IEC and UL 08 Rated insulation voltage U i (pollution degree ) RW7 IEC (V) 90 UL, CSA (V) 00 Rated operational voltage U e UL, CSA (V) 00 IEC (V) 90 Rated thermal current Ith (θ ºC) (A) Rated operational current I e AC- / AC- (IEC 097--) UL, CSA DC- / DC- (IEC 097--) UL, CSA V (A) 0 V (A). V (A) 0 V (A) 00 V (A). 00 V (A) V (A) 0. V (A) 0 V (A) 0. C00 0 V (A) 0. 0 V (A) 0. Short-circuit protection with fuse (gl/gg) (A) Minimum voltage / admissible current (IEC 097--) R00 7 V / ma Terminal Capacity and Tightening Torque - Main Contacts Models RW7 M x 0 Type of screws Phillips Cable size (7 ºC / C u cable) Flexible cable (mm )...0 Cable with terminal / rigid cable (mm )...0 AWG-wire...8 Tightening torque (N.m / lb.in). / 0 Terminal Capacity and Tightening Torque - Auxiliary Contacts Models Type of screws Cable size (7 ºC / C u cable) RW7 M. x 0 Philips Cable with or without terminal (mm ) x... AWG-wire... Tightening torque (N.m / lb.in). / Thermal Overload Relays RW..D (up to 0A) 9
10 Diagrams Motor Protection - Direct Current -Pole Pole + K K FT M_ - FT M_ - - Motor Protection - Alternating Current -Pole -Pole L L L L L L L K K K FT FT FT FT U V W U/T U/T M ~ ~ M ~ ~ Typical Connection - Contactor + Overload Relay Direct On Line Starter ( Direction of Rotation) L Direct On Line Starter ( Directions of Rotation) L 0 0 I I K F R FT K 00 N 9 9 A A A R K K FT N K F K K A A A A K A A A A 0 Thermal Overload Relays RW..D (up to 0A)
11 Dimensions (mm) RW7-D 7.7 7,7 8,7 8.7 ERCRW Drilling Furação of da the porta panel do door painel Ø...7 Ø,...7mm RW7...7 CWB RW7-D A Models A ERC0RW 0 ERC7RW 7 ERC00RW 00 Ø, Ø. Ø, Ø Bobina AC coil CA Bobina DC coil CC A CWB9...8 A AC coil 89. DC coil 9.7 CWB...8 A AC coil 9 DC coil 0. Mounting Position RW7-D 0º 0º Thermal Overload Relays RW..D (up to 0A)
12 AUCKLAND Unit 8, 7 Great South Road, Penrose, Auckland 0, P + 9 0, F MATAMATA - HEAD OFFICE Waihou Street, PO Box, Matamata 0, P , F CHRISTCHURCH Hands Road, Middleton, Christchurch 80, P , F
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